166517387 has 12 divisors (see below), whose sum is σ = 177521616. Its totient is φ = 156157200.

The previous prime is 166517383. The next prime is 166517389. The reversal of 166517387 is 783715661.

It is not a de Polignac number, because 166517387 - 2² = 166517383 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166517383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34178 + ... + 38744.

It is an arithmetic number, because the mean of its divisors is an integer number (14793468).

Almost surely, 2^166517387 is an apocalyptic number.

166517387 is a deficient number, since it is larger than the sum of its proper divisors (11004229).

166517387 is a wasteful number, since it uses less digits than its factorization.

166517387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706 (or 4687 counting only the distinct ones).

The product of its digits is 211680, while the sum is 44.

The square root of 166517387 is about 12904.1616155409. The cubic root of 166517387 is about 550.1568555373.

The spelling of 166517387 in words is "one hundred sixty-six million, five hundred seventeen thousand, three hundred eighty-seven".